Overtone singing or chanting is a guttural style of vocalization that is the oldest form of singing. It uses the throat cavity to produce overtones so that more than one note is heard. By using the lips, tongue, jaw, velum, and larynx, singers can produce different sounds and melodies by just the use of their own bodies. Hums, buzzes and rattles are often part of the sound.
Because of the remoteness of the regions practicing this style of singing, it has been largely unknown until recently. In 2009 there were throat singers performing at the Lowell Folk Festival in Lowell, Massachusetts.